The invention relates to a thermostatic valve top with a thermostatic element,
which has a pressure chamber, in the inner volume-changing
Are arranged means, and with an actuating element, which with a
Dehnzone the thermostatic element is in operative connection, wherein outer shape-changing
Means are provided which from the outside the shape of the pressure chamber
change the expansion zone.
In DE 19 46 555 U
such a thermostatic element is shown, which defines a pressure chamber whose volume varies depending on the temperature. An actuator is provided which is in operative connection with a stretching zone of the thermostatic element. A cap is screwed onto a frame. By rotating the cap relative to the frame, the distance between the frame and a front side of the cap can be changed countries, so that the cap more or less compresses the thermostatic element and thus forms external shape-changing means.
In DE 298 05 921 U1
a regulating valve for hot water circulation systems is described in which from time to time the water is to be brought to an elevated temperature of more than 70 ° C to effect a sterilization. A thermostatic element acts on a plunger, at the lower end of a valve element is attached. The thermostatic element has an upwardly directed piston, which bears against an adjusting screw, which is axially adjustable in a set screw. The adjusting screw is in turn adjustably mounted in an upper portion of a valve bonnet and can be adjusted by means of an adjusting cap. The adjustment cap is used to set the desired circulation temperature.
in residential and office buildings
provided with such thermostatic valve heads. The real thing
is in the opening direction
biased so that a valve pin
on the actuator
the thermostatic valve top is applied. At a low temperature
the pressure chamber in the thermostatic element has its smallest volume,
the action of the valve pin very far into the thermostatic element
can be. The valve is fully open. When the temperature
rises, then the filling expands
of the thermostatic element, for example a gas or a liquid,
optionally also a wax filling,
the volume of the pressure chamber magnification ßert. The
is thereby advanced further in the direction of the radiator valve and
while the radiator valve stronger.
is to change the setpoint of the thermostatic valve top is
it is known to relocate the thermostatic element, either
towards the radiator valve
to set a lower temperature setpoint, or
from the radiator valve
away to a higher one
Set temperature setpoint. This shift is usually done with
Help of a twist grip over
a screw thread on a housing
is attached. The thermostatic element can then directly in the rotary handle
be attached. But it is also possible that the thermostatic element in
an auxiliary device is arranged, which displaces from the rotary handle
Displacement of the thermostatic element sets a certain size of the thermostatic valve top
ahead. The thermostatic valve top must be large enough to cover all positions of the thermostatic element
would like to
However, the size of a thermostatic valve top
Keep small, so that the thermostatic valve attachment is not too far in
the space protrudes. this could
the risk of damage
entail. In addition, usually results in a more pleasing optical
Design, when the thermostatic valve top are kept small
Invention is based on the object, the size of the thermostatic valve top
to keep small.
Task is in a thermostatic valve top of the aforementioned
Sort of solved by
Means an extension of an operating handle
is, which projects into a capsule in which the thermostatic element arranged
With this configuration, it is no longer necessary to shift the thermostatic element as a whole. If you want to achieve a change in the setpoint, then the shape of the pressure chamber is changed, ie the thermostat element is reduced from the outside to further push the actuator out of the thermostatic element, or it is increased, so that the actuator can penetrate further into the thermostatic element. This outer volume change can be effected by an extension of an operating handle, which projects into the capsule, in which the thermostatic element is arranged, so that the outer shape of the thermostatic element changes. The thermostatic element can therefore be completely or partially compressed or expanded. These shape-changing means usually require we niger space as a means that you need to relocate the thermostatic element altogether. When the operating handle with an extension projects into the capsule in which the thermostatic element is arranged, this is a relatively simple way to compress or expand the thermostatic element.
The thermostatic element has an outer peripheral wall which is variable in length
is trained. As a result, a change in length of the thermostatic element
altogether possible. The
Thermostat element can be upset al so causing
continues to be pushed out of the thermostatic element. The thermostatic element
but can also be stretched, which causes the actuator further into the
Thermostat element can be pushed.
in this connection
It is particularly preferred that the outer peripheral wall
has a corrugation. A corrugation, ie a bellows-shaped wall,
is a particularly simple embodiment, the length of the peripheral wall variable
close. The length changes
are small. The corrugation is therefore only weakly stressed on bending.
A corrugation on the outer peripheral wall
of the thermostatic element has about it
addition, the advantage that
thereby the surface
of the thermostatic element increases, the
has contact with the environment. This creates a heat transfer between the thermostatic element
and the environment further improved.
in this connection
it is particularly preferred that the corrugation
on the outer peripheral wall
a smaller number of waves than a corrugation in one
by an invagination
formed Dehnzone in which the actuator is inserted.
This is the consideration
a role that the
of the actuating element
is much larger
as the required length change
of the thermostatic element. Because the changes
of the thermostatic element are small, few waves are sufficient. But
also the number of waves in the stretch zone can be made smaller
be possible than was previously possible in the prior art. The expansion zone is used
only for operation
of the actuating element.
A safety or protection function at too high a temperature
can be ensured by the corrugation of the peripheral wall.
the extension has a screw thread, with the help of
Twisting two parts one for
the thermostatic element more available
is. The power transmission
then takes place directly between the screw thread and the thermostatic element.
There is no danger of transmission elements
in an invalid
So deform a way that one
exact specification of the setpoint is no longer guaranteed. For example
two end faces of the room can be approximated or they can be separated from each other
be removed. As they approach each other, the thermostatic element becomes
compressed so that - one at
constant temperature assuming constant volume of the pressure chamber - the actuator
continues to be pushed out of the thermostatic element. With an extension
of the room, the thermostatic element can extend, so
that the volume
is held constant by the fact that the actuator
further displaced into the thermostatic element.
the thermostatic element has an anti-rotation lock. This can be
by turning the rotary handle or the operating handle, the setpoint change
that must be
Rotates thermostatic element.
the thermostatic element is supported by a pressure spring. This embodiment
has the advantage that one
the shape change
the thermostat element also for
an overpressure protection
can exploit. An overpressure protection
is necessary if the radiator valve
under the action of the actuator already
is closed, by external influences, such as
For example, a strong sunlight or a larger number
of people in the room, a higher one
Temperature arises. In this case increases due to the higher temperature
the pressure in the pressure chamber so strong that the risk of damage to the
Thermostat element or other parts. The actuator
can not dodge further because it is closed by the
is prevented from further movement. In this case it can become
but change the thermostatic element itself by the shape changeability, for example
can it change its length and
Although against the force of the pressure spring.
This change in length
is relatively small because the change in length over a
Cross sectional area
acts. The volume thus results from the stroke of the change in length
and the cross-sectional area
of the pressure chamber.
Assuming a constant temperature, the change in the shape of the pressure space causes the volume ratios or divisions within the pressure space to change. This change can basically only be done by further pushing the actuating element out of the thermostatic element or, in the opposite case, pushing it further into the thermostatic element. This results in a different starting position for the actuator, in other words, a change in the target value. You can change the shape by a short stroke, which acts over a large cross-sectional area. This can be achieved even with short strokes large volume displacements. The movement of the actuating element can thus be achieved by relatively small strokes. It is also possible to change the length of the thermostatic element. This is a relatively simple measure to change the shape of the pressure chamber from the outside so that the corresponding effects occur on the actuator.
Invention will be described below with reference to preferred embodiments
described in more detail in connection with the drawing. Herein show:
1 a schematic cross section through an embodiment of a radiator thermostatic valve top and
2 a schematic representation for explaining the mode of action.
A thermostatic valve top 1 serves to actuate a radiator valve shown only schematically by dashed lines 2 and thus to influence an ambient temperature, that of the through the radiator valve 2 controlled radiator is heated. The radiator valve 2 has an actuating pin 3 on, which is biased in the opening direction, ie from the radiator valve 2 is pushed out.
The thermostatic valve top has a housing 4 on which a twist grip 5 is rotatable.
Inside the rotary handle 5 is a thermostatic element 7 arranged, which has a pressure room 8th having. In the pressure room 8th a liquid or gas filling is arranged, wherein the filling has a strongly temperature-dependent volume, ie at a lower temperature, the volume of the filling in the pressure chamber 8th smaller than at a higher temperature.
In a conventional manner, the thermostatic element 7 an invagination 9 on top of a bellows-shaped wall 10 , which is also called "inner wall", is surrounded. The bellows-shaped wall 10 has a corrugation with a variety of waves 11 on. In the invagination 9 is an actuator 12 used, which is an operating end 13 in turn, with the actuating pin 3 interacts. In other words, the actuating pin presses 3 the actuator 12 as far as it goes, in the thermostatic element 7 into it. At a temperature increase in the pressure chamber 8th , which leads to a change in volume of the filling therein, then the actuator 12 further out of the thermostatic element 7 be pushed out. This in turn causes the actuating pin 3 continue into the radiator valve 2 is pressed in and thus to a greater throttling of the radiator valve 2 leads.
The thermostatic element 7 has a bottom plate 14 and a face plate 15 on. The bottom plate 14 and the face plate 15 are through a peripheral wall 16 connected, which also has a curl 17 with a predetermined number of waves 18 having. This is the peripheral wall 16 variable in length. If the length of the peripheral wall 16 changed, then the shape of the thermostatic element changes 7 ,
The peripheral wall 16 is with her lower end 19 deformed radially outwards. The thermostatic element 7 can with the help of a rotation 21 opposite the housing 4 be secured against rotation.
With the change of the position of the front plate 15 while maintaining the position of the bottom plate 14 is a change in the shape of the thermostatic element 7 connected. If the face plate 15 closer to the bottom plate 14 is approximated, then must be at constant volume in the pressure chamber 8th the actuator 12 further out of the thermostatic element 7 be driven out. Here one makes use of a certain gear ratio to advantage: the face plate 15 acts on a stroke over a partial cross section of the thermostatic element 7 , In order to bring about a corresponding volume compensation, the actuator must 12 then over a distance from the thermostatic element 7 be moved out, which is a multiple of the stroke of the face plate 15 equivalent. This multiple corresponds to the ratio of the cross section of the indentation 9 to the cross section of the face plate 15 ,
This should be exemplified by the 2 be explained. It is assumed that the volume of the pressure chamber 8th in the adjustment of the face plate 15 is constant. This requirement is only made to simplify the explanation. It is not required to the setpoint of the thermostatic valve top 1 to adjust.
If you have the face plate 15 moved by a small stroke a, this has the consequence that in the indentation 9 a corresponding volume must be displaced. But this is a movement of the actuator 12 required by a distance b. Depending on the ratio between the extension of the face plate 15 and the cross section of the invagination 9 This can be a translation by the factor 3 or more, especially 5 or more. This applies in the undisturbed case, ie as long as that Valve is not closed yet and the actuator 12 can still move.
In conventional thermostatic valve elements one expects a change in position of the actuating element 12 of 0.2 mm / ° C. With a setpoint change in the range of 20 ° C, for example from 10 ° to 30 ° C, a movement of 4 mm would accordingly be required. So if you set the target value, as was previously the case, by a displacement of the thermostatic element 7 changed, then you would have the thermostatic element 7 to shift these 4 mm. The fact that now only the shape of the thermostatic element 7 changed, so the face plate 15 shifted, only a stroke of 0.8 mm is required here.
One can therefore calculate which lifting height a of the front plate 15 is required to a desired change in the starting position of the actuating element 12 to effect and then in function of the maximum permissible angle of rotation of the rotary handle 5 the slope of the thread 25 choose.
The housing 4 has a capsule 22 on, in which the thermostatic element 7 is arranged. The twist grip 5 points in its front 23 an extension 24 on, in a tapped hole 25 the capsule 22 intervenes. The threaded connection between the extension 24 and the capsule 22 has a very small pitch of, for example, 3 mm / rev or less, more preferably 1 mm / rev or less. The extension 24 lies on the front plate 15 of the thermostatic element 7 on, with the face plate 15 has a certain rigidity.
The bottom plate 14 of the thermostatic element 7 is by a pressure spring 26 that are on the case 4 supports, in the direction of the face plate 15 pressed. In this case, however, the capsule has a projection 27 on, at which the lower end 19 the peripheral wall or a radial projection of the bottom plate 14 abuts so that the bottom plate 14 while down on the radiator valve 2 To move, the movement of the radiator valve 2 away but limited.
By a rotation of the rotary handle 5 opposite the housing 4 and thus against the capsule 22 becomes the extension 24 further into the capsule 22 moved in or further out of her. This movement of the extension 24 leads to compression or expansion of the thermostatic element 7 and thus to a change in the shape of the pressure chamber 8th , which - at a constant volume - in a movement of the actuator 12 manifests.
If during a change in shape of the pressure chamber 8th at the same time the temperature in the pressure chamber 8th Of course, this is also possible. Then the adjustment of the setpoint is superimposed on a change in the controlled variable.
In the illustrated embodiment, the shape advantage of the thermostatic element has the following advantage: If one imagines a situation in which the radiator valve is completely closed, the actuator 12 So as far as possible from the thermostatic element 7 has been pushed out, but the room temperature continues to rise, then there is a risk of damage to the thermostatic element 7 because of the pressure in the pressure chamber 8th increases. In the present case, the increase in pressure in the pressure chamber 8th but easily possible, because at such a pressure increase the bottom plate 14 against the force of the overpressure spring 26 can shift and thus an increase in volume of the pressure chamber 8th causes, by the a critical increase in pressure in the pressure chamber 8th can be prevented. It is particularly advantageous that the desired increase in volume already at a relatively small displacement movement of the bottom plate 14 results.
Because the displacement movement of the bottom plate 14 is relatively small in the setpoint adjustment as well as in the overpressure protection, it is sufficient if the corrugation 17 the peripheral wall 16 a smaller number of waves 18 has as the corrugation on the inner wall 10 ,
Another advantage is that you at a thermostatic element 7 with a flexible large bellows-shaped peripheral wall 16 the choice is, the pressure room 8th more or less to fill, compared to a conventional thermostatic element, and thereby the gain of the thermostatic element 7 to change. The gain is the ratio of the movement of the actuator 12 to the temperature change.